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Tropaeas
''Tropaeas'' is a genus of sea snails, marine gastropod mollusks in the family Pyramidellidae, the pyrams and their allies.〔Bouchet, P. (2010). ''Tropaeas'' Dall & Bartsch, 1904. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=545285 on 2011-10-26〕 ==General description== The surface of the shell is marked by strong axial ribs. The intercostal spaces are spirally pitted. The early teleoconch whorls are sculptured differently from the later ones. The shell is umbilicated and contains two columellar folds.〔(Dall & Bartsch (1909), A Monograph of West American Pyramidellid Mollusks, United States National Museum, bulletin 68 )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Tropaeas」の詳細全文を読む
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